Hi, I am trying a theoretically easy drag and drop over a GWT 2.5.1 Grid
component using the native DnD. I want to drag the id (as String) of a row
and drop in different position just to change the order of rows. The
process I followed is:
* Initially I tried to drag from the Grid itself as source but then I would
not know how to identify the dragged row.
* So I then thought to drag from a cell/row itself, but I do not know how
to attach the drag events to the cell/rows
* So finally, I decided wrapping my text content on a Label placed within
the Grid cell. With this approach I managed to drag the id of the item with
no problems:
final Label label = new Label("blah blah blah item");
label.getElement().setDraggable(Element.DRAGGABLE_TRUE);
label.addDragStartHandler(new DragStartHandler() {
@Override
public void onDragStart(DragStartEvent event) {
String id = "successfully calculated_id";
event.setData("item", id);
}
});
Then again the same problem for the drop target.
* Ideally I would assign the target to the Grid so I can drop in the middle
of 2 rows. However no drop event looks to be fired at any time. And, even
if it would be fired, again I would not know how to calculate the row/cell
number receiving the drop event.
* So, again I tried assigning the drop target to the same Label instances
as:
label.addDropHandler(new DropHandler() {
@Override
public void onDrop(DropEvent event) {
System.out.println("stop: ");
// prevent the native text drop
event.preventDefault();
}
});
but no drop event looks to be fired. Finally trying to create the drop by
using a DOM Handler:
label.addDomHandler(new DropHandler() {
@Override
public void onDrop(DropEvent event) {
System.out.println("stop: " + event.getSource());
event.preventDefault();
// Do something with dropLabel and dragging
System.out.println("stop: " + event.getSource());
}
}, DropEvent.getType());
again no drop event fired.
So, at the end:
* no problem dragging the id from the source row
* but looks impossible to trigger a event for the target item, not mater
if it is a Label or the Grid itself.
My browser is FF and my API is the Native GWT 2.5.1 DnD. Any
idea/advise/experience/example?
Thanks
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